Honeywell HC900 manual Dce

Components and Architecture - Networking Basics Reference

Name/Acronym	Name/Definition	Comments
Collision	Simultaneous transmission	Collisions can be reduced (and network capacity
	of two nodes on the same	increased) by use of Switches, which partition and
	channel.	isolate collision domains.
Collision	An indication to the Data	Collision Detection causes both nodes to abort
Detection	Link Layer that node	transmission, set a random delay, and attempt re-
	contention (simultaneous	transmission. If contention recurs, each device
	transmission) is present at	doubles delay time before re-transmission;
	the Physical Layer.	successive redoubling is called “exponential back-
		off”.
Crosstalk	Electrical noise coupled
	between media elements
Cross-over Cable	Ethernet cable that enables	In a "cross-over" cable, wiring crosses over from
	connection of DCE to DCE	the Transmit connection pair at one end to Receive
	equipment, or DTE to DTE	connection pair at the other end.
	equipment.
CSMA/CD	Carrier Sense Multiple	All nodes on the same network are free to initiate
	Access w/ Collision	message transmission. If two nodes transmit
	Detection	simultaneously, the collision is detected, and both
		nodes abort transmission and attempt to re-transmit
		after a pause.
CSU/DSU	Channel Service Unit/Data	Converts data from format used by telephone
	Service Unit	company to format usable on LAN.
Cut-Through	Method used by switches	Enhances transmission speed, but reduces
	for filtering messages, based	transmission security and/or reliability.
	on the first few bytes.
Data Link	A logical connection
	between two nodes on a
	network.
Data Link Layer	Layer 2 of the OSI Model	Defines protocols for data packets and how they
	that is media-independent,	are transmitted between networking devices.
	and functions above Layer 1	Includes two sublayers: Media Access Control
	(Physical Layer).	(MAC), and Logical-Link Control (LLC).
Datagram	A series of bits in an	Datagrams are commonly referred to as “Packets”,
	ordered, intelligible	because they are data entities, although Packets
	sequence.	apply only the top layer (Application Layer of the
		OSI Model.
DCE	Data Communications	Devices that transport data between DTE devices.
	Equipment
DHCP	Dynamic Host	Runs in a DHCP server, which assigns an IP
	Configuration Protocol	address to each node that connects to the network.
		(Can not be used in a an HC900 LAN.)
DNS	Domain Name System	An Internet system (resident in a Web Browser)
		that resolves domain names to IP addresses. (For
		example, Http://www.yahoo.com resolves to
		Http://204.71.202.160.)
Domain	On the Internet, a named	User Names/Passwords, and related data on a
	network.	network.
	In MS Windows, an
	elemental administrative
	(security-oriented) unit.

28	HC900 Hybrid Controller Installation and User Guide	Revision 5
		9/03